Tokyo Olympic champion Alexander Zverev feels a changing of the guard is almost complete in men's tennis thinks there is a good chance the next year's Grand Slam titles will be shared between Novak Djokovic, Daniil Medvedev and himself.
The German beat Djokovic en route to gold at the Tokyo Games and ended the year by winning the ATP Finals title for the second time.
Djokovic won three of the year's Grand Slam titles, while his old rivals Rafa Nadal and Roger Federer failed to add to their totals, leaving the trio tied with a record 20 majors each.